Ludwig

Ludwig is the oldest of the Koopalings, and the smartest, most evil, backstabbing bastard in the entire show. Ludwig spends most of his time making inventions and songs, but most of his inventions turn out horribly wrong, and his songs are very bad as well (just watch episode 9).

Ludwig used to be friends with Jr. and Yoshi, but they stopped being friends with him because he betrayed his own alliance, now that his plan failed he's probably gonna go back working for his dad.